Fix: Sent email is plain text if alternate text is empty

1. Fix: Sent email is plain text if alternate text is empty
2. Add: Parse Plain text in normal v2 call

notificationmdl/email/email.go

@@ -81,6 +81,11 @@ func (email *Email) SendMail(templateFilePath string, templateData interface{})
 		loggermdl.LogError(err)
 		return err
 	}
+	err = email.ParsePlainText(email.plainBody, templateData)
+	if errormdl.CheckErr(err) != nil {
+		loggermdl.LogError(err)
+		return err
+	}
 	if err := email.Send(); errormdl.CheckErr1(err) != nil {
 		loggermdl.LogError("error occured while calling SendMail: ", errormdl.CheckErr1(err))
 		return errormdl.Wrap("Failed to send the email to: " + strings.Join(email.to, ", "))
@@ -147,8 +152,12 @@ func (email *Email) Send() error {
 	message.SetHeader("Bcc", email.bcc...)
 	message.SetHeader("Subject", email.subject)
 	message.SetHeader("Message-ID", getMSGIDHeader(domain, guidmdl.GetGUID()))
-	message.SetBody("text/plain", email.body)
-	message.AddAlternative("text/html", email.plainBody)
+	if len(strings.TrimSpace(email.plainBody)) == 0 {
+		message.SetBody("text/html", email.body)
+	} else {
+		message.SetBody("text/plain", email.body)
+		message.AddAlternative("text/html", email.plainBody)
+	}
 
 	for _, attachment := range email.attachments {
 		message.Attach(attachment) // attach whatever you want